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TEMPO oxidation modified straw fiber material, preparation method and application thereof

A straw fiber, oxidation reaction technology, applied in the field of environmental remediation, can solve problems such as rising, and achieve the effects of simple preparation process, easy desorption, and efficient adsorption

Inactive Publication Date: 2020-06-19
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Antibiotics are a common weapon for humans to fight against some harmful microorganisms. However, due to human abuse, the level of antibiotics in the environment has risen sharply, causing some microorganisms to develop resistance and form super-resistant bacteria.

Method used

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  • TEMPO oxidation modified straw fiber material, preparation method and application thereof
  • TEMPO oxidation modified straw fiber material, preparation method and application thereof
  • TEMPO oxidation modified straw fiber material, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Adsorbent material preparation

[0028] Step 1: Add 1g of straw to 90ml of buffer solution with pH 6.86, and add 0.016g of TEMPO and 1.13g of sodium chlorite.

[0029] Step 2: After the reagent is completely dissolved, add 0.5ml of sodium hypochlorite and 9.5ml of buffer solution.

[0030] Step 3: After reacting for 6 hours, the stalks obtained by repeated washing with deionized water and suction filtration were air-dried indoors for later use.

[0031] in figure 1 is the SEM image of unmodified straw fiber; figure 2 It is the SEM image of TEMPO oxidized straw fiber material; image 3 is the AFM image of TEMPO oxidized straw fiber material; Figure 4 is the FTIR diagram of straw fiber before and after modification; Figure 5 is the ZETA potential diagram of straw fiber before and after modification;

[0032] the result shows:

[0033] It can be seen from the scanning electron microscope that the oxidation process tears the surface of the straw to form a large nu...

Embodiment 2

[0038] Adsorption properties of TEMPO oxidized straw fiber materials on SMZ and Cd at different times

[0039] Take 0.05g of material and add it into the Erlenmeyer flask containing 10ml of 3mg / L SMZ, and put the Erlenmeyer flask into the shaker with a temperature of 25 degrees and a rotation speed of 180rpm to carry out the adsorption experiment, respectively in 1h, 3h, 5h , 24h, 48h, 72h, 96h sampling. Three sets of parallel samples were set for each concentration. Then the equilibrated solution was taken out and its concentration was determined by high performance liquid chromatography.

[0040] Take 0.05g of material and add it into a conical flask containing 10ml of 50mg / L Cd, and put the conical flask into a shaker with a temperature of 25 degrees and a rotating speed of 180rpm to carry out the adsorption experiment. , 3h, 5h, 24h, 48h, 72h sampling. Three sets of parallel samples were set for each concentration. Then the equilibrated solution was taken out, and its ...

Embodiment 3

[0046] Adsorption process of Cd and SMZ mixture on TEMPO oxidized straw materials at different pH values

[0047]Take 0.05g of the materials and put them into the Erlenmeyer flask, and prepare 10ml of mixed solutions of SMZ and Cd with different concentrations. The concentration of Cd is 10mg / L, 20mg / L, 50mg / L, 80mg / L, 100mg / L respectively, and the concentration of SMZ is 3mg / L. The pH values ​​of the solutions were adjusted to 2, 5 and 7, respectively, and the Erlenmeyer flask was placed in a shaker with a temperature of 25 degrees and a rotation speed of 180 rpm for adsorption experiments. Samples were taken at 5h. Three sets of parallel samples were set for each concentration. Then the equilibrated solution was taken out, and its concentration was measured by an atomic absorption spectrophotometer.

[0048] in Figure 8 It is a graph of the influence of SMZ pressure on the adsorption of Cd by TEMPO oxidized straw materials at different pH values. The abscissa is the amo...

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Abstract

The invention discloses a TEMPO oxidation modified straw fiber material, a preparation method and application thereof, and relates to the technical field of environmental remediation, wherein the TEMPO oxidation modified straw fiber material can efficiently adsorb heavy metals Cd and sulfamethoxazole. The preparation method comprises the following steps: adding a TEMPO oxidizing agent and sodium chlorite into 60-mesh corn straw in a buffer solution with the pH value of 6.86, adding sodium hypochlorite to start an oxidation reaction after complete dissolution, adding 10 ml of absolute ethyl alcohol after the reaction is finished, carrying out suction filtration with deionized water until the solution is neutral, and airing at room temperature.

Description

technical field [0001] The invention relates to the technical field of environmental restoration, in particular to a TEMPO oxidation-modified straw fiber material and a preparation method and application thereof. Background technique [0002] In recent years, due to the rapid development of human industrial technology and the explosive growth of population, a large amount of heavy metals and antibiotics have entered water bodies. High concentrations of heavy metals will not only affect the water environment and aquatic animals and plants; they will also enter the human body through the skin, respiratory tract, and digestive tract to poison human organs, and even cause death in severe cases. Antibiotics are a common weapon for humans to fight against some harmful microorganisms. However, due to human abuse, the level of antibiotics in the environment has risen sharply, causing some microorganisms to develop drug resistance and form super drug-resistant bacteria. At present, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/20C02F101/38
CPCB01J20/24C02F1/286B01J2220/4825C02F2101/38C02F2101/40C02F2101/20B01J2220/4806
Inventor 郑刘春余华俭吴思婷张涛任静静张世平
Owner SOUTH CHINA NORMAL UNIVERSITY
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